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      1 /*
      2  * Copyright (C) 2009 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include "config.h"
     32 #include "bindings/v8/V8DOMWrapper.h"
     33 
     34 #include "V8HTMLCollection.h"
     35 #include "V8HTMLDocument.h"
     36 #include "V8Window.h"
     37 #include "bindings/v8/V8Binding.h"
     38 #include "bindings/v8/V8HiddenPropertyName.h"
     39 #include "bindings/v8/V8ObjectConstructor.h"
     40 #include "bindings/v8/V8PerContextData.h"
     41 #include "bindings/v8/V8ScriptRunner.h"
     42 
     43 namespace WebCore {
     44 
     45 static v8::Local<v8::Object> wrapInShadowTemplate(v8::Local<v8::Object> wrapper, Node* impl, v8::Isolate* isolate)
     46 {
     47     // This is only for getting a unique pointer which we can pass to privateTemplate.
     48     static int shadowTemplateUniqueKey;
     49     WrapperWorldType currentWorldType = worldType(isolate);
     50     V8PerIsolateData* data = V8PerIsolateData::from(isolate);
     51     v8::Handle<v8::FunctionTemplate> shadowTemplate = data->privateTemplateIfExists(currentWorldType, &shadowTemplateUniqueKey);
     52     if (shadowTemplate.IsEmpty()) {
     53         shadowTemplate = v8::FunctionTemplate::New(isolate);
     54         if (shadowTemplate.IsEmpty())
     55             return v8::Local<v8::Object>();
     56         shadowTemplate->SetClassName(v8AtomicString(isolate, "HTMLDocument"));
     57         shadowTemplate->Inherit(V8HTMLDocument::domTemplate(isolate, currentWorldType));
     58         shadowTemplate->InstanceTemplate()->SetInternalFieldCount(V8HTMLDocument::internalFieldCount);
     59         data->setPrivateTemplate(currentWorldType, &shadowTemplateUniqueKey, shadowTemplate);
     60     }
     61 
     62     v8::Local<v8::Function> shadowConstructor = shadowTemplate->GetFunction();
     63     if (shadowConstructor.IsEmpty())
     64         return v8::Local<v8::Object>();
     65 
     66     v8::Local<v8::Object> shadow = V8ScriptRunner::instantiateObject(shadowConstructor);
     67     if (shadow.IsEmpty())
     68         return v8::Local<v8::Object>();
     69     shadow->SetPrototype(wrapper);
     70     V8DOMWrapper::setNativeInfo(wrapper, &V8HTMLDocument::wrapperTypeInfo, impl);
     71     return shadow;
     72 }
     73 
     74 v8::Local<v8::Object> V8DOMWrapper::createWrapper(v8::Handle<v8::Object> creationContext, const WrapperTypeInfo* type, void* impl, v8::Isolate* isolate)
     75 {
     76     V8WrapperInstantiationScope scope(creationContext, isolate);
     77 
     78     V8PerContextData* perContextData = V8PerContextData::from(scope.context());
     79     v8::Local<v8::Object> wrapper = perContextData ? perContextData->createWrapperFromCache(type) : V8ObjectConstructor::newInstance(type->domTemplate(isolate, worldTypeInMainThread(isolate))->GetFunction());
     80 
     81     if (type == &V8HTMLDocument::wrapperTypeInfo && !wrapper.IsEmpty())
     82         wrapper = wrapInShadowTemplate(wrapper, static_cast<Node*>(impl), isolate);
     83 
     84     return wrapper;
     85 }
     86 
     87 static bool hasInternalField(v8::Handle<v8::Value> value)
     88 {
     89     if (value.IsEmpty() || !value->IsObject())
     90         return false;
     91     return v8::Handle<v8::Object>::Cast(value)->InternalFieldCount();
     92 }
     93 
     94 #ifndef NDEBUG
     95 bool V8DOMWrapper::maybeDOMWrapper(v8::Handle<v8::Value> value)
     96 {
     97     if (!hasInternalField(value))
     98         return false;
     99 
    100     v8::Handle<v8::Object> object = v8::Handle<v8::Object>::Cast(value);
    101     ASSERT(object->InternalFieldCount() >= v8DefaultWrapperInternalFieldCount);
    102 
    103     v8::HandleScope scope(v8::Isolate::GetCurrent());
    104     ASSERT(object->GetAlignedPointerFromInternalField(v8DOMWrapperObjectIndex));
    105 
    106     const WrapperTypeInfo* typeInfo = static_cast<const WrapperTypeInfo*>(object->GetAlignedPointerFromInternalField(v8DOMWrapperTypeIndex));
    107 
    108     return typeInfo->ginEmbedder == gin::kEmbedderBlink;
    109 }
    110 #endif
    111 
    112 bool V8DOMWrapper::isDOMWrapper(v8::Handle<v8::Value> value)
    113 {
    114     if (value.IsEmpty() || !value->IsObject())
    115         return false;
    116 
    117     v8::Handle<v8::Object> wrapper = v8::Handle<v8::Object>::Cast(value);
    118     if (wrapper->InternalFieldCount() < v8DefaultWrapperInternalFieldCount)
    119         return false;
    120     ASSERT(wrapper->GetAlignedPointerFromInternalField(v8DOMWrapperObjectIndex));
    121     ASSERT(wrapper->GetAlignedPointerFromInternalField(v8DOMWrapperTypeIndex));
    122 
    123     const WrapperTypeInfo* typeInfo = static_cast<const WrapperTypeInfo*>(wrapper->GetAlignedPointerFromInternalField(v8DOMWrapperTypeIndex));
    124 
    125     // FIXME: Add class id checks.
    126     return typeInfo->ginEmbedder == gin::kEmbedderBlink;
    127 }
    128 
    129 bool V8DOMWrapper::isWrapperOfType(v8::Handle<v8::Value> value, const WrapperTypeInfo* type)
    130 {
    131     if (!hasInternalField(value))
    132         return false;
    133 
    134     v8::Handle<v8::Object> wrapper = v8::Handle<v8::Object>::Cast(value);
    135     ASSERT(wrapper->InternalFieldCount() >= v8DefaultWrapperInternalFieldCount);
    136     ASSERT(wrapper->GetAlignedPointerFromInternalField(v8DOMWrapperObjectIndex));
    137 
    138     const WrapperTypeInfo* typeInfo = static_cast<const WrapperTypeInfo*>(wrapper->GetAlignedPointerFromInternalField(v8DOMWrapperTypeIndex));
    139     return typeInfo->ginEmbedder == gin::kEmbedderBlink && typeInfo == type;
    140 }
    141 
    142 }  // namespace WebCore
    143